\defmodule {MultiFunction}

This interface should be implemented by classes which represent \emph{multivariate}
mathematical functions. It is used to pass an arbitrary function of a vector
variable as argument to another function.

\bigskip\hrule\bigskip

\begin{code}\begin{hide}
/*
 * Class:        MultiFunction
 * Description:
 * Environment:  Java
 * Software:     SSJ
 * Copyright (C) 2001  Pierre L'Ecuyer and Universite de Montreal
 * Organization: DIRO, Universite de Montreal
 * @author       Richard Simard
 * @since        May 2013

 * SSJ is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License (GPL) as published by the
 * Free Software Foundation, either version 3 of the License, or
 * any later version.

 * SSJ is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * A copy of the GNU General Public License is available at
   <a href="http://www.gnu.org/licenses">GPL licence site</a>.
 */
\end{hide}
package umontreal.iro.lecuyer.functions;


public interface MultiFunction\begin{hide} {\end{hide}
\end{code}
\begin{code}

   public double evaluate (double[] X);
\end{code}
\begin{tabb}
   Returns the value of the function evaluated at $X$.
\end{tabb}
\begin{htmlonly}
   \param{X}{point at which the function is evaluated}
   \return{value of function at \texttt{X}}
\end{htmlonly}
\begin{code}\begin{hide}
}\end{hide}
\end{code}
